Heat Controller R410A manual R410a Application and Service Guide, R410a Overview, R407c Overview

R410a Application and Service Guide

Although the bulk of this manual is information regarding R410a, R407c will also be discussed for purposes of comparison and since it is one of the so- called new refrigerants.

R410a Overview

R410a is a non-chlorine based (HFC) refrigerant, that with R407c and R134a, is seen as the future of all refrig- erants used worldwide. R410a characteristics compared to R22 are:

•Binary and near azeotropic mixture of R32-50% and R125-50%

•Higher efficiencies

•Higher operating pressures

•Requires POE oil in compressors

•In some systems can result in smaller heat exchang- ers with the same performance

•Low global warming potential and zero ozone depletion (0.39/0.0)

•Temperature glide of 0.2°F

•Containers are “ROSE” colored

R407c Overview

R407a is a non-chlorine based (HFC) refrigerant. R407c characteristics compared to R22 are:

•Ternary and near azeotropic mixture of R32-23%, R125-25%, R134a-52%

•Slightly lower efficiencies

•Nearly equal operating pressures

•Requires POE oil in compressors

•Considered a near drop-in replacement for R22

•Low global warming potential and zero ozone depletion (0.34/0.0)

•Temperature glide of 10°F

•Containers are “MEDIUM BROWN” colored

What is “Glide”?

Pure compounds like CFC-R12 boil and condense at exactly the same temperature for a given pressure. Near- azeotropic blends are not pure compounds but a blend of compounds. These compounds will have a temperature glide or range of temperatures in which the blend will boil or condense. In these situations, for example R407c, a chart listing a bubble and dew point must be used as the pressure/temperature chart since it has a glide of 10°F. The bubble point is used for subcooling calculations. The dew point is used for superheat calculations. See Table 1. R410a has a very small glide (0.2°F) and acts as a single component refrigerant. Therefore R410a can

utilize a more traditional table with only one pressure column as shown in Table 2.

What is “Fractionation”?

Many of the newer refrigerants are a blend of two or more other refrigerants. At various conditions these compo- nents can separate and change the ratio of the original mixture and in effect change the total performance of the remaining blend. Therefore it is recommended to use the refrigerant in liquid form, insuring that all of the compo- nents are handled together in the proper blend.

Table 1. R407c Pressure/Temperature Chart

R407c

Temperature	Bubble	Dew
	Pressure	Pressure
° F	(for subcooling)	for (superheat)
	psig	psig
-15	17.2	9.2
-10	21.0	12.3
-5	25.1	15.7
0	29.5	19.4
5	34.4	23.4
10	39.6	27.8
15	45.2	32.6
20	51.3	37.8
25	57.8	43.4
30	64.8	49.4
35	72.4	56.0
40	80.4	63.0
45	89.0	70.6
50	98.1	78.7
55	107.9	87.4
60	11 8.2	96.7
65	129.2	106.6
70	140.9	1 17.1
75	153.2	128.4
80	166.2	140.4
85	1 80.0	153.1
90	194.6	166.5
95	209.9	180.8
100	226.0	195.9
105	243.0	21 1.9
11 0	260.8	228.7
11 5	279.5	246.5
120	299.0	265.3
125	319.6	285.0
130	341.0	305.8
135	363.4	327.6
140	386.9	350.5
145	41 1.3	374.6
150	436.8	399.8

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